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Aggregate 2021年第3期2卷 40-53页

作者： Xin Deng Xiaohui Yu Jinchong Xiao Qichun Zhang College of Chemistry and Environmental Science Key Laboratory of Chemical Biology of Hebei ProvinceKey Laboratory of Medicinal Chemistry and Molecular DiagnosisMinistry of EducationHebei UniversityBaodingP.R.China Department of Materials Science and Engineering City University of Hong KongHong KongP.R.China

Construction of crystalline homo/heteroaggregation at micro/nanometer level from organicπ-conjugated systems is of great importance because the controllable morphologies(i.e.,size,shape,and dimension)could provide diverse optoelectronic properties for different applications in the electrooptical *** this review,we summarize our recent progress in the self-assembly of micro/nanostructures of organicπ-conjugated molecules via the heteroaggregation and homoaggregation *** also discuss various factors(i.e.,temperature,solvents,and surfactants)that affect the aggregation process through a surfactant-assisted reprecipitation ***,their physical properties and possible applications in electronics and biofields are illustrated.

关键词： arene hetero/homoaggregation organic device photophysics self-assembly

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Selective hydrogenation of crotonaldehyde over Ir/TiO₂ catalysts: Unraveling the metal-support interface related reaction mechanism

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Journal of Catalysis 2023年第1期425卷 57-69页

作者： Jia, Aiping Zhang, Wei Peng, Hantao Zhang, Yunshang Song, Tongyang Li, Lei Ye, Yanwen Wang, Yu Luo, Mengfei Chen, De-Li Huang, Weixin Lu, Ji-Qing Key Laboratory of the Ministry of Education for Advanced Catalysis Materials Institute of Physical Chemistry Zhejiang Normal University Jinhua 321004 China Hefei National Laboratory for Physical Sciences at the Microscale Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes CAS Key Laboratory of Materials for Energy Conversion Department of Chemical Physics University of Science and Technology of China Hefei 230026 China Shanghai Key Laboratory of Green Chemistry and Chemical Processes School of Chemistry and Molecular Engineering East China Normal University Shanghai 200062 China Dalian National Laboratory for Clean Energy Dalian 116023 China

For the supported catalysts for the selective hydrogenation of α, β - unsaturated aldehyde with H2, tailoring of metal - support interfacial effect to improve reaction performance is a significant but challenging su... 详细信息

For the supported catalysts for the selective hydrogenation of α, β - unsaturated aldehyde with H₂, tailoring of metal - support interfacial effect to improve reaction performance is a significant but challenging subject. In this work, we regulated both the size regimes of the Ir deposits (single atom, nanocluster and nanoparticle) and the crystal plane of anatase TiO₂ (TiO₂(1 0 1), TiO₂(1 0 0) and TiO₂(0 0 1)) so as to alter the Ir-TiO_x interfacial properties, in order to unravel reaction mechanism of selective hydrogenation of crotonaldehyde over the Ir/TiO₂ catalysts. Both the activity and selectivity to crotyl alcohol increased as the Ir size grew from single atom to nanoparticle, ascribed to high Ir⁰ content, high concentration of surface defects and prominent H-spillover effect on the Ir nanoparticles. Moreover, the in situ Fourier transform infrared spectroscopy (FTIR) and density functional theory (DFT) calculations demonstrated that an end-on C[dbnd]O adsorption mode for crotonaldehyde molecule was favored at the Ir-TiO_x interface particularly at high H coverage, which thus facilitated the hydrogenation of C[dbnd]O bond to form crotyl alcohol. Moreover, the highest reactivity of the Ir nanoparticles was evidenced by the lowest reaction barrier. These results explicitly demonstrate that larger metal nanoparticles and adsorption geometry of the reactant at the metal - support interface are vital for improved catalytic performance, which would shed light on the ingenious catalyst design. © 2023 Elsevier Inc.

关键词： Density functional theory H-spillover effect Hydrogenation Ir/TiO2 Nanocluster Nanoparticle Single atom α, β - unsaturated aldehyde

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A Sustainable Manufacturing Paradigm to Address Grand Challenges in Sustainability and Climate Change

ACS Sustainable Resource Management

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ACS Sustainable Resource Management 2024年第11期1卷 2334-2337页

作者： Haihui Pu Jinrui Zhang Chao Liang Mark C. Hersam Stuart J. Rowan Wei Chen Santanu Chaudhuri Elizabeth A. Ainsworth DoKyoung Lee Jonathan Claussen Yuxin Chen Rebecca Willett Jennifer B. Dunn Junhong Chen Pritzker School of Molecular Engineering University of Chicago Chicago Illinois 60637 United States Chemical Sciences and Engineering Division Physical Sciences and Engineering Directorate Argonne National Laboratory Lemont Illinois 60439 United States Department of Chemical and Biological Engineering Northwestern University Evanston Illinois 60208 United States Institute for Sustainability and Energy at Northwestern Northwestern University Evanston Illinois 60208 United States Department of Materials Science and Engineering Department of Chemistry and Department of Electrical and Computer Engineering Northwestern University Evanston Illinois 60208 United States Department of Chemistry University of Chicago Chicago Illinois 60637 United States Department of Mechanical Engineering Northwestern University 2145 Sheridan Road Evanston Illinois 60208 United States Department of Civil Materials and Environmental Engineering Chemical Engineering and Department of Chemistry University of Illinois Chicago Chicago Illinois 60439 United States USDA Agricultural Research Service Global Change and Photosynthesis Research Unit Urbana Illinois 61801 United States Department of Crop Sciences and Institute for Sustainability Energy & Environment University of Illinois at Urbana-Champaign Champaign Illinois 61801 United States Department of Mechanical Engineering Iowa State University Ames Iowa 50011 United States Department of Computer Science University of Chicago Chicago Illinois 60637 United States Department of Statistics University of Chicago Chicago Illinois 60637 United States

Adopting a holistic approach to manufacturing that strikes a balance between economic, ecological, and social viability and well-being has the potential to address the grand challenge of climate ch...

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Precise Synthesis of Hollow Mesoporous Palladium–Sulfur Alloy Nanoparticles for Selective Catalytic Hydrogenation

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CCS Chemistry 2022年第8期4卷 2854-2863页

作者： Hao Lv Lizhi Sun Dongdong Xu Wei Li Bolong Huang Ben Liu Key Laboratory of Green Chemistry and Technology of Ministry of Education College of ChemistrySichuan UniversityChengdu 610064 Jiangsu Key Laboratory of New Power Batteries Jiangsu Collaborative Innovation Center of Biomedical Functional MaterialsSchool of Chemistry and Materials ScienceNanjing Normal UniversityNanjing 210023 Department of Chemistry Laboratory of Advanced MaterialsShanghai Key Laboratory of Molecular Catalysis and Innovative MaterialsiChEM and State Key Laboratory of Molecular Engineering of PolymersFudan UniversityShanghai 200433 Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic UniversityHung HomKowloonHong Kong SAR 999077

Hollow mesoporous metals have unique potential for catalysis,but their precise synthesis and further elaboration of their structure–performance relationships are still huge ***,wereport a new synthetic strategy,named the Kirkendall effect in synergistic template(KEST),for the desired preparation of hollow mesoporous palladium–sulfur(h-mesoPdS)alloy nanoparticles.

关键词： mesoporous material hollow cavity palladium hydrogenation selective catalysis

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Radiation balanced spherical microlaser 3

Radiation balanced spherical microlaser

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Photonic Heat Engines: science and Applications III 2021

作者： Xia, Xiaojing Pant, Anupum Felsted, R. Greg Gariepy, Rachel E. Davis, E. James Pauzauskie, Peter J. Molecular Engineering and Science Institute University of Washington SeattleWA United States Materials Science and Engineering Department University of Washington SeattleWA United States Chemical Engineering Department University of Washington SeattleWA United States Physical and Computational Sciences Directorate Pacific Northwest National Laboratory RichlandWA United States

ISBN: (数字)9781510642409

ISBN: (纸本)9781510642393

Microlasers based on lanthanide-doped upconverting nanoparticles (UCNPs) have been demonstrated but radia- tion balanced lasing (RBL) remains a challenge. We present a novel design of radiation-balanced microlaser using microspheres coated with UCNPs. The model is tested using nitrogen vacancy doped nanodiamonds (NV:NDs) coated on silica microspheres. High quality factor enhancement of selective bands in the NV spectral features due to coupled whispering gallery modes (WGMs) was measured. The temperature of NDs on silica spheres was measured experimentally using Debye-Waller factor thermometry and analyzed using a novel analytical heat transfer model for spherical coordinates with localized sources. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： Whispering gallery modes

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Computational design of a double-clad radiation-balanced fiber laser 3

Computational design of a double-clad radiation-balanced fib...

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Photonic Heat Engines: science and Applications III 2021

作者： Xia, Xiaoxing Pant, Anupum Gupta, Chaman Davis, E. James Pauzauskie, Peter J. Molecular Engineering and Science Institute University of Washington SeattleWA United States Materials Science and Engineering Department University of Washington SeattleWA United States Chemical Engineering Department University of Washington SeattleWA United States Physical and Computational Sciences Directorate Pacific Northwest National Laboratory RichlandWA United States

ISBN: (数字)9781510642409

ISBN: (纸本)9781510642393

We report a new radiation-balanced laser design of a cladding-pumped double-clad fiber laser based on Yb-doped silica. The single-mode glass core has a high Yb doping level for lasing, whereas the inner cladding is cooling- grade silica glass with a low Yb concentration. Multimode pumping propagates along the inner cladding, scaling up the signal and extracting heat generated inside the core due to quantum defects and concentration quenching. Both analytical and numerical methods are used to calculate the electric-field and temperature distribution in the fiber. The core temperature is reduced significantly due to anti-Stokes cooling of the inner cladding. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： Fiber lasers

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In situ structural determination of 3d and 5d perovskite oxides under high pressure by synchrotron x-ray diffraction

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Physical Review B 2023年第13期108卷 134106-134106页

作者： Jie Chen Jiaming He Yanyao Zhang Stella Chariton Vitali Prakapenka Kazunari Yamaura Jung-Fu Lin J. B. Goodenough J.-S. Zhou Materials Science and Engineering Program Mechanical Engineering University of Texas at Austin Austin Texas 78712 USA Department of Earth and Planetary Sciences Jackson School of Geosciences The University of Texas at Austin Austin Texas 78712 USA Center for Advanced Radiation Sources The University of Chicago Illinois 60637 USA Research Center for Materials Nanoarchitectonics (MANA) National Institute for Materials Science 1-1 Namiki Tsukuba Ibaraki 305-0044 Japan Graduate School of Chemical Sciences and Engineering Hokkaido University North 10 West 8 Kita-ku Sapporo Hokkaido 060–0810 Japan

In contrast to the Mott transition found in RNiO3 (R= rare earths), the metal-insulator transition temperature in the perovskite NaOsO3 is not sensitive to pressure. The peculiarity may be correlated to how the crystal structure of NaOsO3 responds to high pressure, which has been rarely studied so far. The pressure-induced bond-length shrinking can increase the orbital overlap integral and therefore the electron bandwidth. However, in the orthorhombic perovskite structure, the pressure-induced bending in the bond angle Os-O-Os may compensate for the bandwidth broadening due to the bond-length shrinking in some circumstances. A recent structural study on polycrystalline NaOsO3 indicated that orthorhombic distortion is enlarged under high pressure. But, how the local structure changes under pressure remains unknown. Moreover, a highly unusual phase transition from the orthorhombic phase (Pbnm) to a polar phase (Pbn21) occurs at around 18 GPa [Sereika et al., npj Quantum Mater. 5, 66 (2020)]. Motivated by these concerns, we have done a more comprehensive structural study on NaOsO3 using single-crystal diffraction with synchrotron radiation at high pressures up to 41 GPa. Diffraction patterns over the entire pressure range can be refined well with the Pbnm structural model. Moreover, the refinement results reveal in detail how the local structures change under pressure corresponding to the enhanced orthorhombic distortion from the lattice parameters. We have carried out a systematic study for understanding the pressure effect on the orthorhombic perovskites in the context of the influences of the charge distributions in the ABO3 formula, i.e., A3+B3+O3, A2+B4+O3, and A1+B5+O3 and the B-site cations from the 3d to the 4d and 5d row of elements. To fulfill this purpose, we have revisited two families of 3d perovskites: RCrO3 and RFeO3.

关键词： Phase transitions Crystal structures X-ray diffraction

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Electron configurations at 3d orbital of metal ion determining charge transition process in memory devices

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science China materials 2021年第7期64卷 1713-1722页

作者： Jiacong Guo Yankun Zhang Guofeng Tian Deyang Ji Shengli Qi Dezhen Wu Wenping Hu State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing 100029China Tianjin Key Laboratory of Molecular Optoelectronic Science Department of ChemistryInstitute of Molecular Aggregation ScienceTianjin UniversityTianjin 300072China Beijing National Laboratory for Molecular Sciences Beijing 100190China Changzhou Institute of Advanced Materials Beijing University of Chemical TechnologyChangzhou 213164China Tianjin Key Laboratory of Molecular Optoelectronic Science Department of ChemistrySchool of ScienceTianjin University&Collaborative Innovation Center of Chemical Science and EngineeringTianjin 300072China

Functional polymeric materials with electrical bi-stable states possess significant potential for high-density data storage due to their nanoscale memory site,threedimensional-stacking ability and intrinsic *** polyimides bearing donor-acceptor(D-A)skeleton could form the charge transfer complex(CTC)under an electrical field,leading to their feasibility as memory *** novel porphyrinated polyimides DATPP-DSDA,Zn-DATPP-DSDA and Mn-DATPP-DSDA were designed and synthesized for information memory *** ions with different electron configurations at 3 d orbital have a determining influence on memory behaviors of polyimides:nonvolatile write-once-read-many-times memory(WORM)for DATPP-DSDA,volatile static random access memory(SRAM)for Zn-DATPP-DSDA,but no memory performance for *** comparing the contribution of orbital transition and hole-electron distribution of chargetransfer excited states,roles of metal ions in regulating memory types were *** simulation results indicate that the Zn ion could play a bridge role in paving the route for excited electrons from a D to an A,while a trap role for the Mn ion in hindering this *** study proves the feasibility of the strategy for modulating the memory behaviors of porphyrinated polyimides by varying the central metal ion and provides the exact effects of various metal ions on regulating charge transfer processes.

关键词： memory polyimide porphyrin charge transfer

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Sn-Mediated Local Atomic Ordering Enhances Reversible Anionic Redox Activity in Cation-Disordered Li1.3Mn0.4Nb0.3O2 Cathodes

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Advanced Energy materials 2025年第0期

作者： Sun, Gang Nie, Dan Zhu, Qingjun Gao, Lijun Chang, Yi-Hung Liu, Han Yang, Jiayi Ren, Yang Shao, Yu-Cheng Ishii, Hirofumi Sui, Xulei Wang, PanPan Wang, Hsiao-Tsu Wang, Zhenbo Shenzhen Key Laboratory of Special Functional Materials Shenzhen Engineering Laboratory for Advance Technology of Ceramics Guangdong Research Center for Interfacial Engineering of Functional Materials Guangdong Provincial Key Laboratory of New Energy Materials Service Safety College of Materials Science and Engineering Shenzhen University Shenzhen518071 China Bachelor's Program in Advanced Materials Science Tamkang University No.151 Yingzhuan Rd. Tamsui Dist. New Taipei25137 Taiwan Department of Physics City University of Hong Kong 999077 Hong Kong National Synchrotron Radiation Research Center 101 Hsin-Ann Road Hsinchu Science Park Hsinchu300092 Taiwan State Key Laboratory of Space Power-Sources MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage MOE Engineering Research Center for Electrochemical Energy Storage and Carbon Neutrality in Cold Regions School of Chemistry and Chemical Engineering Harbin Institute of Technology Harbin150001 China

Recent advances in lithium-ion batteries have revealed the potential of Li-excess cation-disordered rock salt (DRX) cathodes, which expand the design space for cathode materials. The evidence of facile lattice substitution further provides a key strategy for activating redox reaction centers and enhancing the cycling performance of such materials. Here, the study explores how Sn-mediated local atomic ordering enhances reversible anionic redox activity in Li1.3Mn0.4Nb0.3O2 through the use of aberration-corrected scanning transmission electron microscopy, ex/in situ X-ray techniques, and theoretical calculation. The results demonstrate that Sn incorporation optimizes the local atomic structure, fostering the formation of rapid Li+ diffusion "elevator" pathways and short-range ordered structures, thereby enhancing the Li+ transport network. Additionally, quantitative analysis of the redox pathways and degree of participation for Mn and O during charge–discharge cycles reveals that the Sn-mediated electrode exhibits enhanced anionic O redox activity at high charging voltages, maintaining elevated activity throughout subsequent cycling. This sustained performance not only indicates increased redox capabilities but also suggests improved structural stability. By elucidating the complex interplay between composition, local structure, and performance, this study advances the understanding of DRX materials and underscores the potential of strategic elemental substitution for optimizing disordered cathode materials in next-generation energy storage systems. © 2025 Wiley-VCH GmbH.

关键词： Redox reactions

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Lignocellulose aerogel and amorphous silica nanoparticles from rice husks

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Journal of Leather science and engineering 2021年第1期3卷 11-17页

作者： Zichao Wei Andrew T.Smith William R.T.Tait Jingjing Liu Hao Ding Hui Wang Weixing Wang Luyi Sun Polymer Program Institute of Materials ScienceUniversity of ConnecticutStorrsCT 06269USA Department of Chemical&Biomolecular Engineering University of ConnecticutStorrsCT 06269USA College of Materials Science and Engineering South China University of TechnologyGuangzhou 510640GuangdongChina Key Laboratory of Enhanced Heat Transfer and Energy Conservation of the Ministry of Education School of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhou 510640GuangdongChina Department of Biomedical Engineering University of ConnecticutStorrsCT 06269USA

Rice Husks(RHs)are one of the most abundant sources of biomass in the world due to rice *** and silica are two of the main components of RHs,which allow RHs to be applied in different *** can be partially dissolved in 1-butyl-3-methylimidazolium chloride(BMIMCl),which is a simple way of competing with the traditional extraction methods that suffer from high chemical consumption.A lignocellulose freeze gel is obtained via a cyclic liquid nitrogen freeze-thaw(NFT)***-functional self-assembled lignocellulose aerogel is obtained after CO_(2) supercritical *** on the aerogel’s special properties,two routes are developed for practical *** one hand,the aerogel is coated to exhibit a superhydrophobic property that can be applied as an absorbent for oil *** the other hand,a carbon aerogel is synthesized via a pyrolysis process,resulting in a porous amorphous *** residue after partially dissolving lignocellulose in BMIMCl is further calcined to obtain amorphous silica nanoparticles,achieving a comprehensive application of RHs.

关键词： Rice husks Lignocellulose Carbon aerogel Silica

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